• matrix = np.eye(3,3) creates a 3D 3x3 (thanks hv) matrix with 1's in the diagonal and 0 elsewhere. (or load it from JSON).
• you mentioned points being byte data, np.frombuffer(points, dtype=np.float32) converts it into a list of float32. And then it swaps the bytes - re: little endian etc.
• d.reshape(-1,6) converts above list into a matrix with number of cols = 6 and any number of rows it can fit.
• d[:,2] the 3rd column of matrix d
• pressure = (d[:,2] / pressure_norm) ** pressure_pow create a pressure vector based on d where each item is divided by pressure_norm and then raise to pressure_pow power. (I guess ** is raising to a power)
• points.shape[0] is the number of rows of points (remember it was reshaped to have 6 columns and any number of rows it fits).
• np.ones([points.shape[0],1]), create a vector of 1s (i,e. a matrix of 1 column, that's the '1' in the expression) with as many rows as the reshaped points of the last bullet
• append that vector into points hence increase the number of rows by 1 adding a vector of 1s at the end.
• points @ matrix.T I guess it transposes points (rows become columns) it is multiplying the matrix 'points' by the transpose of 'matrix' (see NERDVANA's Re: Translating python math to Perl).
• points = points[:, :2] get the 3rd column (0-based indexing) of the current points

my python is very limited so all above with caution. All the above can be done with pure perl but perhaps a dedicated module or PDL can be employed.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.